s flagellar locomotion is controlled by eleven chemoreceptors. Assessment of the distribution of the relevant chemoreceptor genes in the genomes deposited in the National Center for Biotechnology Information (NCBI) database led to the identification of two previously unknown genes and a pseudogene. These two chemoreceptor genes share the same locus in the genome with and , but the gene region encoding the periplasmic ligand binding domain differs significantly from other chemoreceptor genes. Hence, they were named and . Consequently, it was of interest to study their distribution in subpopulations of different clonality, and their cooccurrence with the eleven previously reported chemoreceptor genes. Therefore, the presence of all genes was detected by polymerase chain reaction (PCR) in 292 multilocus sequence typing (MLST)-typed isolates from different hosts. The findings show interesting trends: , and appeared to be mutually exclusive and cooccur in a minor subset of isolates. was found to be present in only 33.56% of all tested isolates and was significantly less often detected in turkey isolates. was tested positive in only 17.8% of the isolates, while was detected in 29.5% of all isolates, and was found to be present in 38.7%.
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| http://dx.doi.org/10.1556/1886.2015.00041 | DOI Listing |
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